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公开(公告)号：US11626720B1
公开(公告)日：2023-04-11
申请号：US17749743
申请日：2022-05-20
发明人： Huy D. Nguyen , Tom Lik-Chung Lee
摘要： A multiphase ground fault circuit interrupter includes a first phase power line input, a second phase power line input, a third phase power line input, a neutral line input, a controller circuit having a relay control output, a first phase latching relay having a first phase switch input coupled to the first phase power line input and a first phase relay control input coupled to the relay control output of the controller circuit, a sensor having a core and a sensor pickup coupled to the controller circuit, and a first phase load wire coupled to a first phase switch output of the first phase latching relay and passed through the core.
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公开(公告)号：US08698426B1
公开(公告)日：2014-04-15
申请号：US14073811
申请日：2013-11-06
发明人： Huy D. Nguyen , Tom Lik-Chung Lee
IPC分类号： H05B37/02
CPC分类号： H02H3/006 , G01R31/3277 , G01R35/005 , H02H1/063 , H02H3/04 , H02H3/08
摘要： An apparatus for setting a digital setpoint for a self-powered current sensing switch includes a current transformer, a digital processor and a parallel converter for converting the AC output of the current transformer to a DC power source for the digital processor along a first path and into a digital signal which is input to the digital processor along a second path. The apparatus also includes a manually operated switch coupled to the digital processor and having a calibration mode position, code segments executing on the digital processor to convert the digital signal to a digital setpoint value when the manually operated switch is in the calibration mode position, and non-volatile memory for storing the digital setpoint value.
摘要翻译： 用于设置用于自供电电流感测开关的数字设定点的装置包括电流互感器，数字处理器和并行转换器，用于将电流互感器的AC输出沿着第一路径转换为用于数字处理器的DC电源， 转换为沿着第二路径输入到数字处理器的数字信号。 该装置还包括一个手动操作的开关，其耦合到数字处理器并且具有校准模式位置，当手动操作的开关处于校准模式位置时，在数字处理器上执行的代码段将数字信号转换成数字设定值，以及 用于存储数字设定值的非易失性存储器。
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公开(公告)号：US20140354439A1
公开(公告)日：2014-12-04
申请号：US14226758
申请日：2014-03-26
发明人： Huy D. Nguyen , Roger Borders , Tom Lik-Chung Lee
CPC分类号： G08B21/182 , G01R15/09 , G01R15/183 , H02H3/006 , H02H3/04 , H02H3/08 , H02H3/0935 , H02H3/20
摘要： An electrical sensor is described. The electrical sensor including an electrical signal input configured to receive an electrical signal, an alarm, one or more inputs configured to set a configuration value and at least one display configured to display said configuration value. The monitor is coupled with the electrical signal input, the alarm, the display, and the one or more inputs. Further, the monitor is configured to determine a characteristic of the electrical signal received on the electrical signal input. The monitor is configured to activate the alarm based on the configuration value set by the one or more inputs and the characteristic of the electrical signal. And, the monitor configured to generate at least one display signal based on the configuration value to be used by the at least one display to display the configuration value.
摘要翻译： 描述了电传感器。 电传感器包括被配置为接收电信号的电信号输入，警报，被配置为设置配置值的一个或多个输入和被配置为显示所述配置值的至少一个显示器。 监视器与电信号输入，报警，显示和一个或多个输入相结合。 此外，监视器被配置为确定在电信号输入上接收的电信号的特性。 监视器被配置为基于由一个或多个输入设置的配置值和电信号的特性来激活警报。 并且，所述监视器被配置为基于要由所述至少一个显示器使用的配置值来生成至少一个显示信号以显示所述配置值。
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公开(公告)号：US10790659B1
公开(公告)日：2020-09-29
申请号：US16913781
申请日：2020-06-26
发明人： Tom Lik-Chung Lee
摘要： A multi-phase VFD system with frequency compensated ground fault protection includes a variable frequency drive (VFD) power supply, a motor coupled to the VFD power supply by a plurality of power wires and a relay, an annular magnetic core provided with a sensor winding, where the plurality of power wires extend through the annular magnetic core, an analog signal conditioner, an analog-to-digital (A/D) converter, and a digital processor performing a Fast Fourier Transform (FFT) process on the received digital output of the A/D converter to provide frequency information which is used to develop a frequency equalized transfer function for calculating ground fault current.
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5.发明授权公开(公告)号：US08589101B1
公开(公告)日：2013-11-19
申请号：US13784702
申请日：2013-03-04
发明人： Huy D. Nguyen , Tom Lik-Chung Lee
IPC分类号： G01M19/00
CPC分类号： G01R19/02 , G01R19/2509
摘要： An apparatus for measuring RMS values of burst-fired currents includes a current sensor having a signal output, an analog-to-digital (A/D) converter coupled to the signal output of the current sensor, a digital processor coupled to an output of the A/D converter, and a digital memory coupled to the digital processor. Code segments stored in the digital memory are executable on the digital processor and implement a process of: a) initially sampling the output of the A/D converter; b) determining from the initial sampling a burst-fired current pattern; c) sampling the output of the A/D converter N times within a burst-fired current pattern to provide N samples; and d) calculating an RMS value from the N samples.
摘要翻译： 用于测量突发电流的RMS值的装置包括具有信号输出的电流传感器，耦合到电流传感器的信号输出的模拟数字（A / D）转换器，耦合到 A / D转换器和耦合到数字处理器的数字存储器。 存储在数字存储器中的代码段可在数字处理器上执行，并实现以下过程：a）对A / D转换器的输出进行初始采样; b）从初始采样确定爆发电流模式; c）在爆发电流模式中对A / D转换器的输出N次采样以提供N个采样; 和d）从N个样本计算RMS值。
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公开(公告)号：US09747776B2
公开(公告)日：2017-08-29
申请号：US14226758
申请日：2014-03-26
发明人： Huy D. Nguyen , Roger Borders , Tom Lik-Chung Lee
IPC分类号： G08B21/00 , G08B21/18 , G01R15/18 , G01R15/09 , H02H3/00 , H02H3/04 , H02H3/08 , H02H3/093 , H02H3/20
CPC分类号： G08B21/182 , G01R15/09 , G01R15/183 , H02H3/006 , H02H3/04 , H02H3/08 , H02H3/0935 , H02H3/20
摘要： An electrical sensor is described. The electrical sensor including an electrical signal input configured to receive an electrical signal, an alarm, one or more inputs configured to set a configuration value and at least one display configured to display said configuration value. The monitor is coupled with the electrical signal input, the alarm, the display, and the one or more inputs. Further, the monitor is configured to determine a characteristic of the electrical signal received on the electrical signal input. The monitor is configured to activate the alarm based on the configuration value set by the one or more inputs and the characteristic of the electrical signal. And, the monitor configured to generate at least one display signal based on the configuration value to be used by the at least one display to display the configuration value.
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公开(公告)号：US09618541B1
公开(公告)日：2017-04-11
申请号：US15134328
申请日：2016-04-20
发明人： Huy D. Nguyen , Tom Lik-Chung Lee
CPC分类号： G01R15/148 , G01R15/183 , G01R15/185 , G01R19/20
摘要： A magnetometer that senses low level currents flowing in a conductor or wire includes two cores with excitation windings on each core that are connected in series but which are wound in opposite orientations. A periodic alternating current drives the windings. Since the windings are in series but oppositely wound, the current flowing through the windings will produce equal but opposite flux flows in the two cores. A sensing winding is wound around both cores to provide flux profiles. A digital processor analyzes a quiescent flux profile, which is generated when no sense current is flowing through the dual cores, and distorted flux profiles when sense currents are flowing through the dual cores to measure a sense current flowing through the dual cores.
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公开(公告)号：US09041390B1
公开(公告)日：2015-05-26
申请号：US14476495
申请日：2014-09-03
发明人： Huy D. Nguyen , Tom Lik-Chung Lee
CPC分类号： G01R33/0023 , G01R15/125 , G01R15/202 , G01R19/32 , G01R33/0029 , G01R33/0035 , G01R33/0082 , G01R33/07
摘要： A direct current transducer includes an open-loop Hall-effect sensor, a first ADC coupled to the open-loop Hall-effect sensor, a thermistor, a second ADC coupled to the thermistor, a manually controlled mode-selection device, a digital processor coupled to the first ADC and the second ADC, and digital memory coupled to the digital processor. The manually controlled mode-selection device is operative to develop an operating mode selection digital signal for a plurality of operating modes including a temperature-compensated direct current (DC) transducer mode and a calibration mode.
摘要翻译： 直流换能器包括开环霍尔效应传感器，耦合到开环霍尔效应传感器的第一ADC，热敏电阻，耦合到热敏电阻的第二ADC，手动控制模式选择装置，数字处理器 耦合到第一ADC和第二ADC，以及耦合到数字处理器的数字存储器。 手动控制模式选择装置可操作以开发包括温度补偿直流（DC）换能器模式和校准模式的多种操作模式的操作模式选择数字信号。
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